Set repo branch name to BRANCH_CURRENT
Set repo branch name to BRANCH_CURRENT

When creating the repository, set the current (default) branch name to
whatever is configured in BRANCH_CURRENT.  When BRANCH_CURRENT is master
this is a no-op which git ignores.

Signed-off-by: Kevin Locke <ffb4761cba839470133bee36aeb139f58d7dbaa9@kevinlocke.name>

kevinoid/git-branch-is,kevinoid/git-branch-is,kevinoid/git-branch-is